Abstract
Catalysts of highly dispersed gold supported on ceria were prepared by deposition precipitation method. Au is dispersed as Au0, Au+ and Au3+ species on ceria. The content of Au+ and Au3+ was highest on catalyst prepared on uncalcined ceria, which possess least ordered surface. It is inferred that oxygen vacancy on disordered ceria surface is essential for the preparation of highly dispersed gold catalysts and in stabilizing monolayer surface Au+ clusters while cationic vacancies are sites for substitutional Au3+. Au/CeO2 catalysts showed low-temperature isobutane oxidation activity with maximum conversion at 150–180°C. Ex-situ XPS results demonstrated that the low temperature isobutane oxidation activity was closely related to the content of Au+ which we interpreted as surface gold oxide formed under reaction conditions. Isobutane oxidation activity associated with ceria at temperature above 300°C was enhanced by substitutional Au3+.
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Ying Fang got his master’s degree in Physical Chemistry (2007) at the Xiamen University with researches in the field of heterogeneous catalysis. Ying joined Dr. Lai’s research group at the Hong Kong Baptist University in Dec 2006 as a PhD student. His present research focuses on the development, synthesis, and characterization of ceria supported noble metal catalysts for VOCs complete oxidation.
Shuiju Wang is Professor of the State Key Laboratory for Physical Chemistry of Solid Surface at Xiamen University. He is a member of ISO/TC201 (Surface Chemical Analysis). His research interest is in the physical chemistry of solid surface, micro-nanometer scale structural analysis of materials, and in heterogeneous catalysis.
Chak-Tong Au is Professor of Department of Chemistry of the Hong Kong Baptist University. Before joining HKBU in 1990, he did research in the University College, Cardiff, Wales and then joined the Department of Chemistry, Xiamen University in 1986 as associate professor and was promoted to professor in 1987. In 2003, he was awarded D.Sc. degree by the University of Liverpool in recognition of his contributions in the field of surface science and heterogeneous catalysis. At present, he serves as associate editor of the Elsevier journal Applied Catalysis A: General.
Suk-Yin Lai is Associate Professor at the Department of Chemistry and Director of the Centre for Surface Analysis of the Hong Kong Baptist University. Her research interest is in the application of solid catalysts in pollution abatement and in the application of surface analysis techniques for catalyst characterization.
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Yinga, F., Wang, S., Au, CT. et al. Effect of the oxidation state of gold on the complete oxidation of isobutane on Au/CeO2 catalysts. Gold Bull 43, 241–251 (2010). https://doi.org/10.1007/BF03214994
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DOI: https://doi.org/10.1007/BF03214994